Furnace attachment



(No Model.)

W H ELWELL FURNACE ATTACHMENT.

v No. 532,452.

. Patented Jan. '15, 1895.

lnal position.

which the valves are hung.

" UNITED STATES PATENT OFFICE.

WILLIAM H. ELWELL, OF SALISBURY, NEW YORK.

FURNACE ATTACHMENT.

SPECIFICATION forming part of Letters Patent No. 532,452, dated January15, 1895.

Application filed July 21, 1894:. Serial No. 518,288- (No model.)

To aZZ whom it may concern.-

Be it known that I, WILLIAM H. ELWELL, of Salisbury, in the county ofHerkimer and State of New York, have invented a certain new and usefulImprovement in Hot-Air- Furnace Attachments; and I do hereby declarethat the following is a full, clear, and exact description of theinvention, which will enable others skilled in the art to which itappertains to make and use the same, reference being had to theaccompanying drawings and the letters and figures of reference, markedthereon, which form a part of this specification. V

Heretofore an objectionable feature in the use of hot air furnaces forheating purposes has been a loss of a large portion of warm air duringwindy weather, which makes its escape on account of suction caused bywind blowing past the end of the cold air box or duct, as usuallyconstructed.

Figure 1 shows my furnace attachment in perspective and located adjacentto a building wall through which the cold air duct passes in the usualmanner. Fig. 2 shows an end view of the attachment. Fig. 3 shows avertical central cross section. Fig 4. shows a longitudinal section withthe valves in nor- Fig. 5 shows the same with a heavy current of airentering from one side only. Fig. 6 shows details of the frame in Fig. 7shows a single valve removed. I

The device consists-of abox-like body A having four sides and open endsas shown at B and O. The cold air duct D connects with an openingE inone of the sides and extends to the hotair furnace in the usual mannerof such cold air supply ducts. In each end of the body are providedframes consisting of supporting bars 1 and 2 with top and bottom crossbars 3 and 4:. These frames may be removably secured in the body bynails or screws. In the inclined supporting bars 1 and 2 the valves 5are mounted on pivots a-a in each end thereof. The valve consistspreferably of a comparatively heavy rod or bar 5 extending across oneside of the valve, giving strength to the valve, and a light thin bodyportion 5", easily actuated by'the currents of air. The pivotal pointsof the valves being in the inclined supporting pieces cause the valvesto stand normally in partially opened position and the width of thevalve and arrangement of pivotal points are such that the pivotal edgeof the valve will act as a stop to the swinging edge of the next highervalve. The bottom frame-bar 4 acts as a stop for the lower valve of eachseries. The valve bearings in one or both of the supporting bars 1 and 2may be slotted out to the upper side of the bar, as shown at m, to allowthe valves to be removed.

In use, the valves under normal condition, hang suspended in partiallyopen position as shown in Fig. 4:, allowing air to enter freely fromboth ends of the device, as indicated by arrows in Fig. 4; but, whenaffected by a heavy current of air coming from one direction, the valveson that side are opened to their full capacity, and those-on theopposite side closed, as shown in Fig. 5. In case the current of airshould come from the opposite direction to that shown in Fig. 5, thevalves would automatically adjust themselves to the reversed conditions.

What I claim as new,;and desire to secure by Letters Patent, is

The combination in a furnace attachment, of a body having open ends, anoutlet opening between the ends, a series of automatic inwardly openingvalves supported on hori zontal pivots at each open end, the severalvalves of each series being pivoted in difierent horizontal and verticalplanes and standing'normally in open position, substantially as setforth.

WM. H. ELWELL.

